W64/Thgil.8CD8!tr.ransom

Analysis

W64/Thgil.8CD8!tr.ransom is a detection for a Ransomware trojan.
Below are some of its observed characteristics/behaviours:

• This malware may drop any of the following file(s):
  
  • !=How_to_decrypt_files=!.txt: This file is a txt file and will serve as ransom notes. It may be dropped in every affected folder.


• This malware was also observed to affect/encrypt files located on shared drive within the same subnet.


• Affected files of this Ransomware will use the filenaming format {OriginalName.Ext}.[email address].lightning, or {OriginalName.Ext}.[email address].divine.


• Below is illustrations of the malware's Ransom notes:
  

  Figure 1: Ransom notes.

  
  

Recommended Action

• Make sure that your FortiGate/FortiClient system is using the latest AV database.
• Quarantine/delete files that are detected and replace infected files with clean backup copies.